7G 



300 yards further up the valley the angle of dip increased to 81° 

 with a due W. direction, and a little higher up again it was found 

 to be 75° in a W.N.W. direction. In a gully about half a mile 

 to the South-West the dip was taken by Mr. Brittlebank at 85° 

 to the N.W. 



Sellick's Hill. 



In continuation of these researches, last month I visited 

 Sellick's Hill, situated 32 miles to the South of Adelaide, with 

 the hope of finding Cambrian fossils in the neighbourhood, the 

 locality being in the line of strike of the Cambrian limestones of 

 Normanville. The result exceeded my most sanguine expecta- 

 tions. Not only was the fossiliferous horizon easily discovered, 

 but it proved to be much richer in organic remains than the out- 

 crop at Norman ville. The principal coralline belt is literally 

 crowded with the remains of Archcnocyathince throughout a 

 vertical section of not less than 100 feet, and was traced in a 

 continuous outcrop of equal richness and thickness for a distance of 

 eight and a-half miles in a North-East and South- West direction. 



The main road, in the gradient of Sellick's Hill, passes over 

 the exposed beds nearly at right angles to the line of strike, and 

 in a distance of about a mile and a-half rises to a height of 1,200 

 feet above sea level. The road cuttings therefore afford excellent 

 sections of the geological features. The beds are much folded 

 and crushed, exhibiting throughout a high angle of dip. These 

 beds can be naturally divided on lithological grounds into three 

 very distinct groups, which, in ascending order, are as follows : 

 — Argillites, Limestones, and Quartzites. 



In the following Sketch and Table will be found the leading 

 features of the series as exposed in the road cuttings. 



NW 



•QUARTZITES 



CALCAREOUS 



"'argillites PLIOCENE 



Section of Sellick's Hill. 

 Distance — One-and-a-quarter Miles, 

 I. Quartzites. — These occupy the higher elevations of the 

 Ranges and are of great thickness, but sub-divided for the most 



